protected UndoItem(string description, object target, UndoItem.TransactionState state = UndoItem.TransactionState.None)
{
this.Target = target;
this.Description = description;
this.State = state;
this.isCommitted = state == UndoItem.TransactionState.None || state == UndoItem.TransactionState.Commit;
if (this.State != UndoItem.TransactionState.Begin)
return;
this.TransactionList = new List<UndoItem>();
}
internal bool AddTransactionItem(UndoItem item)
{
if (item.State == UndoItem.TransactionState.Begin || item.State == UndoItem.TransactionState.None)
throw new ArgumentException("Undo item must be of type Commit or Payload in order to be added to the current undo transaction.");
if (this.isCommitted)
throw new ArgumentException("Undo item can not be added to a undo transaction in committed state.");
if (item.State == UndoItem.TransactionState.Commit)
{
this.Description = item.Description;
this.isCommitted = true;
this.TransactionList.ForEach((Action<UndoItem>) (ti => ti.isCommitted = true));
}
this.TransactionList.Add(item);
return this.isCommitted;
}
public void Push(UndoItem item, bool resetRedoStack)
{
if (this.Suspend)
return;
if (item.State == UndoItem.TransactionState.Begin)
this.transactionItem = item;
else if (item.State != UndoItem.TransactionState.None && this.transactionItem.AddTransactionItem(item))
{
item = this.transactionItem;
this.transactionItem = (UndoItem) null;
}
if (this.undoItems.Count == this.maxDepth)
this.undoItems.RemoveAt(0);
this.undoItems.Add(item);
if (resetRedoStack)
this.redoItems.Clear();
this.UndoRedoAvailableChanged();
}
public void Push(UndoItem item)
{
this.Push(item, false);
}